a = 1
b = dict(b1=[0, 1, 2], b2=None)
c = (1, 2)
d = 'string'

"""
>>> from mmcv import Config
>>> cfg = Config.fromfile('config.py')
>>> cfg
Config (path: config.py): {'a': 1, 'b': {'b1': [0, 1, 2], 'b2': None}, 'c': (1, 2), 'd': 'string'}
"""